Stay-bolt structure.



B. E. D. STAFFORD & E. I. DODDS.

STAY BOLT STRUCTURE.

APPLICATION FILED NOV. 2!, I91 v 1,25%,3Q9 Patented Jan. 1,1918

9 I I a :imNaAMIN nnjsrArronn ANn ETI-IAN I. DODDS,'OE PITTSBURGH, PENNSYLVANIA, ASSIGNORS.TQrFLANNERY, BOLT COMPANY, or PITTSBURGH, PENNSYLVANIA.

" sTAY OLT strauozrunnf,

burgh, in the cou'nty'ef Allegheny ma State of Pennsylvania, have invented certain new and useful Improvements in Stay-Bolt Structures; and we do hereby declare the following, to be a full, clear, and exact description of the invention, such as w1ll enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in stay bolt structures, and more particu-' larly to mechanical means for testing the integrity of the bolt,--the object of the present invention bein to provide simple and efiicient means Wl'llCh shall be cooperable with the head of the bolt in a flexible stay bolt structure, to permit the condition of the bolt to be ascertained without removing any part of the structure.

\Vith this object in view, the invention consists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional view howing a stay bolt structure embodying our improvements; Fig. 2 is a sectional. view taken at right angles to Fig. 1, and Figs. 3 and 4 are sectional views showing a modified construction.

1 represents a bearing sleeve threaded exteriorly for connection with an outer boiler sheet, as is well understood. The sleeve is provided interiorly with a bearing 2 for the rounded head 3 of a stay bolt 4 and with a flaring bore 5 to permit lateral movement of the bolt. The head of the bolt may be provided with a recess 6 which,'.in the embodiment of the invention shown in the drawings, may be made rectangular in cross-section.

A rotary driving member 7 is mounted upon the outer end of the bearing sleeve 1. This rotary member is made angular in form to receive a wrench and it is provided with an annular flange 8 seated against the end of the bearing sleeve. A cap or collar 9 is screwed on the bearing sleeve 1, and this cap or collar is provided at its outer edge with an inwardly projecting annular flange 10 Specification of Letters Patent. 4' Application fil ed November 21,191 Seria1l\1'o.132,595.

Patented Jan. 1, 1918..'

which-overlies the flange 8 of the rotary member 7 and thus said rotary member is connected with the bearing sleeve.

The rotary member 7 isintended to act as supporting and driving means for a tongue 'or'key 11, and for this purpose, the said member 7 is provided interiorly with a dove-- tailed recess 12 in which the dove-tailed upper edge 13 of the tongue or key 7 is freely disposed. The tongue or key 7 is thu hung Within the driving member 7 and it'is'of suflicient dimensions to depend into the recess 6 in the bolt head, but sufliciently smaller than said recess as not to interfere with the normal lateral play of the bolt.

Normally, the member 7 may be held tight by means of the cap or collar 9, but when it is desired to test the bolt, the attendant may loosen said collar and then, with the use of a Wrench applied to the angular body of said member 7, he may attempt to turn the same. If the rotary member 7 refuses to turn farther than may be permitted by the loose fit of the tongue or key in the slot in the bolt head, the attendant will know that the bolt is good, but if said rotary member turns freely, this fact will indicate that the bolt is broken.

In the form of the invention shown in Figs. 3 and 4, the rotary driving member is made in the form of a hollow partly spherical cap 14 provided with an angular enlargement 15 on its top to receive a Wrench,said cap being provided with an angular flange 8 held to the sleeve 1 by means of the flange 10 on cap or collar 9, as in the construction shown in Figs. 1 and 2. The enlargement 15 is made with a dovetailed recess 16 to receive the contracted outer portion of a wedge-shaped tongue or key l7,the broader inner end of the latter entering the recess in the bolt head. The operation of this form of the invention is the same as that described in connection with Figs. 1 and 2.

\Ve do not claim broadly, in this case, a testing member to engage the bolt and mounted to be turned to test the integrity of the bolt, the same being covered in our copending application Serial No. 83,146, nor do we claim broadly in this case, the testing member having a port disposed within the cap and operatively associated with the bolt,

e and a, bolt having a head. mountd-i'flssiil I 6. .11. um be w n A w 95% e P and v part Pmiesi pg hwehihe ear. he. same b cation, Serial No. 130,047

Having fully described our invention Whatme claim asinewr and: desireto. seeure by LetterseBatent, iss-r.

1. The combinatlon with a bearingjs leeve s1eeve,v0f a rotary member, means oonneotinglseidrotanirvlnembenwith the sleevefsirid rotary member and bol pl eg gl; re 7 cesses, and a separate tongue or key mount- QT'Tli qqmbmiqe w th; a bearin kew theiirecess the-bolt Heiiii end i- 19 heriug hfi idrmemit si m, Said $1 8 1;. grav e i a? i Qf fai'y'ineinber'fiafing an lnterior dove tailed recess, and a tongue having a part loosely mounted; in the earmarked. iesfifififnfiii teenil n ony whereof, We have signeci this speoi fioacion in the presence of two subscribi 5 wieeees BENJAMIN E. D. STAFFORD;

Witnesses: 1 

